Results demonstrate uncertainty about the impact of aircraft
on ozone chemistry, and about lower stratosphere processes. Under
one scenario, ozone loss at high latitudes will decrease, and
ozone will increase in low to mid-latitudes.

Results are generally consistent with two-dimensional models.
However, comparisons with measurements suggest that fossil-fuel
combustion, stratospheric NOx production and aircraft emissions
are not the only significant sources of free tropospheric NOy
over Hawaii and Alaska.

Model results for the transport and dispersion of aircraft
exhaust tracer suggest that, although more tracer from the
tropical flight corridor is transported to higher altitude than
from other corridors, one corridor is not inherently more or less
polluting than another.